Treatment of the title compounds with either H3PO4 or BF3 · Et2O affords the bridged tricyclic lactones 3 and 7 as main products (57 and 70% yield, resp.). This is an efficient and novel access to specifically functionalised molecules possesing the bicyclo[3.2.1]octane skeleton. Lactones 4 and 5 and the bicyclic ketone 6 were formed as by-products (2, 7, and 10% yield, resp.).
用H 3 PO 4或BF 3 ·Et 2 O处理标题化合物,可得到桥联的
三环内酯3和7为主要产物(收率分别为57%和70%)。这是对具有
双环[3.2.1]辛烷骨架的特定功能化分子的有效且新颖的获取途径。形成内酯4和5以及双环酮6作为副产物(分别为2%,7%和10%的收率)。